$(document).ready(function() {
	$('dt').click(function() {
		$(this).siblings('dd').toggle();
		if($(this).siblings('dd').css('display') == 'none')
		$('img', this).attr('src', 'http://static.yueshihui.com/admin/images/menu-item.png');
		else
		$('img', this).attr('src', 'http://static.yueshihui.com/admin/images/menu-item-drop.png');
	});
});